The XtSetKeyTranslator function sets the
specified procedure as the current key translator. The default translator
is XtTranslateKey, an XtKeyProc that uses Shift and Lock modifiers
with the interpretations defined by the core protocol. It is provided so
that new translators can call it to get default KeyCode-to-KeySym translations
and so that the default translator can be reinstalled.

The XtTranslateKeycode
function passes the specified arguments directly to the currently registered
KeyCode to KeySym translator.

The XtRegisterCaseConverter registers the
specified case converter. The start and stop arguments provide the inclusive
range of KeySyms for which this converter is to be called. The new converter
overrides any previous converters for KeySyms in that range. No interface
exists to remove converters; you need to register an identity converter.
When a new converter is registered, the Intrinsics refreshes the keyboard
state if necessary. The default converter understands case conversion for
all KeySyms defined in the core protocol.

The XtConvertCase function calls
the appropriate converter and returns the results. A user-supplied XtKeyProc
may need to use this function.